Step 1: Gather Materials

Materials Needed For Project:

-Tennis Ball
-Fins made of your cardboard
-Garbage bag for Parachute
why have to be a tennis ball?<br>I mean it's too heavy for a simple water-pumped- by-bike-pumper-rocket<br>should i or can i use a small rock instead of a tennis ball?<br>the rocket is already heavy you know<br>
why do you need the tennis ball?
I have not built one of these, but I think the tennis ball acts as a gravity triggered release mechanism for the parachute. It pulls or pushes it out.<br> <br> If the parachute remains in a dry section of the device, talcum powder may be a cheap and effective material that helps the plastic &quot;chute&quot; slide out easier.<br>
This is driving me nuts!!! :-0 several instructable - all similar - apparently from the same set of master instructions call for the use of a tennis ball in the construction of the water rocket BUT it never gets used. Has the makings of an episode of NCIS!

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